JPH0819966A - Pipe wrench - Google Patents

Abstract

PURPOSE:To provide a pipe wrench which can surely hold a round bar without slipping or falling off from the round bar to be rotated during the operation. CONSTITUTION:An inserted tooth 23 to be brought into contact with the circumference wall of a round bar is formed into a projecting curved shape, while the inserted tooth 23 is arranged across a main body 22 provided with a gripping stem. In the main body 22, an upper jaw 30 having a tooth which is opposed to the inserted tooth 23 and is formed into a recessed curved shape is arranged so that it is moved parallelly to the main body 22, and torque working for pushing up the inclined face of the round bar to be held is applied to the round bar, so that the round bar can be surely held.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe wrench improved for a member of a round bar such as a pipe so that the biting thereof can be more reliably performed.

[0002]

2. Description of the Related Art A conventional example of the present invention will be described with reference to the drawings. FIG. 7 is an explanatory view of a pipe wrench showing a conventional example of the present invention. As shown in FIG. 7, a pipe wrench 1 shown in the conventional example has a main body 2 in which a tooth 4 for contacting a peripheral wall of a round bar is provided at one end thereof and a handle 4 for gripping is provided at the other end thereof.
And an L-shaped upper jaw 6 having teeth 7 arranged to face the tooth implant 3 provided on the main body, and a support 10 for moving the upper jaw and the main body 2 in parallel. The main body 2, the upper jaw 6 and the support 10 will be described in more detail.

The main body 2 is provided with a toothed tooth 3 having a serrated surface at one end and a round bar-shaped handle 4 for facilitating gripping at the other end. The upper jaw 6 is formed in an L-shape, and the tooth 7 having a serrated surface is provided on the inner side of the bent jaw similarly to the planting tooth 3. A screw groove 8 is provided around the L-shaped rod portion. Support 10
Is a plate shape bent into a U shape, is arranged so as to sandwich the main body 2, and is rotatably attached by a shaft 15. This support sets the upper jaw 6 in a slidable state within its U-shape. The support body 10 is provided with an opening penetrating both sides of the plate body bent in a U shape, and the round nut 12 is located in the opening, and the round nut 12 is provided on the upper jaw 6. It is attached to the thread groove 8. Therefore, by rotating the round nut 12, the upper jaw 6 can be moved in the direction A indicated by the arrow in the figure to match the diameter of the round bar. Further, the upper jaw 6 is supported by a support 10 which is supported by the main body 2 at one point, and is indicated by an arrow B in the figure so that a certain amount of backlash may occur.
It is set so that it can be moved to the position of the dotted line in the direction. This is because the planted teeth 3 and the teeth 7 are opened so as to form an inverted V shape so that the pipe can be easily gripped.

An example of use of the pipe wrench 1 thus constructed will be described with reference to the drawings. FIG. 8 is a diagram illustrating the use of a conventional pipe wrench. To use the conventional pipe wrench 1, rotate the round nut 12 to rotate the upper jaw 6
Round rod 1 such as a pipe by sliding
A round bar can be sandwiched by the mouth 9 according to the diameter of 8.

[0005]

According to the conventional pipe wrench, it is preferable that the tooth 3 and the tooth 7 are new, but if the contact portion is worn out due to age, the holding force for the round bar 18 is deteriorated. However, there is a drawback that the pipe wrench may slip or come off during operation. As shown in FIG. 8, this is because the teeth 7 come into contact with each other at an angle orthogonal to the horizontal axis H of the round bar 18, so that when the handle 4 is pressed in the C direction, the teeth 7 come into contact with the round bar 18.
This is because a force in the E direction, which is parallel to the vertical axis V and is slippery, is applied, and the holding force becomes weak at the abutting portions of both. The present invention has been made to solve such a problem,
An object of the present invention is to provide a pipe wrench that can reliably hold a round bar.

[0006]

In order to solve the above problems, the present invention has the following configuration. A handle for gripping is formed on one end of which a tooth for contacting the peripheral wall of the round bar is formed in a convex curved shape, and the tooth is arranged so as to be oblique to the handle. Formed a body. An upper jaw having teeth that were formed in a concave curved shape was disposed adjacent to the main body so as to face the tooth implants. The upper jaw has a thread groove at one end thereof, and a support body, which is slidable with respect to the main body by rotation with a round nut, is attached to the main body to provide a pipe wrench according to claim 1. The pipe wrench according to claim 2, wherein the curved tooth implant is formed in a straight line, and the tooth provided on the upper jaw so as to be opposed to the tooth implant is also formed in a straight line. The support body is supported by the main body at one point to set the upper jaw in a rotatable state, and the opening of the mouth of the round bar is set to be narrower than the inner portion thereof. It was a pipe wrench against.

[0007]

[Function] By providing the teeth and the teeth so as to be oblique to the longitudinal direction of the main body having the handle for gripping, the contact angle between the round bar and each tooth is different, and each tooth is different from the round bar. It works in the direction of biting and can be firmly held. Further, not only by obliquely intersecting the tooth and the tooth with respect to the main body, but also by bending the tooth, the contact with the round bar changes from a line to a surface to widen the abutting portion, so that it can be held more firmly. It is possible. Further, when the opening side of the mouth is narrowed and the inner part thereof is widened, the angle is set so that the tooth implant and the tooth hold the round bar more firmly.

[0008]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view showing a pipe wrench of the present invention, and FIG. 2 is an exploded perspective view showing a main part of FIG. As shown in FIG. 1, the pipe wrench 20 of the present invention has a main body 22 in which a curved plant tooth 23 that abuts on the peripheral wall of a round bar is provided at one end thereof and a handle 28 for gripping is provided at the other end thereof. And an L-shaped upper jaw 30 having teeth 34 arranged opposite to the teeth 23 provided on the main body, and a support body 40 that translates the upper jaw and the main body 22. These body 22 and upper jaw 30
The support 40 and the support 40 will be described in more detail, mainly regarding the characteristics of the present invention.

The main body 22 is provided with a curved plant tooth 23, which is a feature of the present invention, at one end thereof, and a handle 28 similar to the conventional example is formed on the other end side thereof. The planted tooth 23 is composed of a curved surface 24 having a saw-toothed tooth profile that abuts on a round bar and has a convex curved center portion. The curved surface 24 is not arranged orthogonally to the longitudinal direction of the main body 22 as seen in other conventional products, but is arranged at an angle so as to be oblique. There is.

The upper jaw 30 has a substantially L-shape with its tip bent, and the inside of the bent jaw 3 has a curved tooth 3 which is a feature of the present invention.
4 and a thread groove 36 on the outer periphery of the other end which is not bent. The tooth 34 has a concave central portion corresponding to the tooth 23 provided on the main body 22.
Similarly, the curved surface 35 has serrated teeth. This curved surface is the curved surface 2 of the obliquely implanting teeth 23 provided on the main body 22.
Since the upper jaw 30 is opposed to the upper jaw 30, the upper jaw 30 is arranged so as to be oblique to the longitudinal direction.

The support 40 is bent in a U shape and is provided with openings 42 on both side walls thereof into which a round screw 45 can be inserted, which is substantially the same as the conventional example. Body 2 formed in this way
2, the upper jaw 30 and the support 40 are assembled as shown in FIG. That is, the round nut 45 is inserted into the opening 42 provided in the U-shaped support 40, and the upper jaw 3
The support 40 and the upper jaw 30 are combined by fitting the thread groove provided in 0 to the round nut. With the combined upper jaw support, the support attachment portion 25 provided at one end of the main body 22 is inserted into the U-shape of the support to support at one point. In this, the support body 40 is attached so as to be able to rotate to some extent by being pivotally supported by a pin body (not shown).

An example of use of the pipe wrench 20 thus constructed will be described with reference to FIG. FIG. 3 is an explanatory diagram showing a usage example of FIG. Pipe wrench 20 of the present invention
When using, the same as in the conventional example is used. That is, the round nut 45 is rotated to move the upper jaw 30,
The round bar is sandwiched between the implant teeth 23 and the teeth 34 while setting the distance between the mouths 29 according to the diameter of the round bar 18 to be sandwiched. The round bars 18 each have a curved surface, and are held between the teeth 23 and 34, which are arranged in parallel, as shown in FIG. 3.
With the conventional pipe wrench 1, the teeth on the upper jaw are
Abut on the horizontal axis H of the round bar. However, in the pipe wrench 20 of the present invention, the teeth 34 are angled so as to be oblique to the main body 22, so that as shown in FIG. Abut on the side. On the contrary, the teeth of the plant teeth 23 are in contact with the upper side of the horizontal axis H. This means that when the handle of the main body 22 is pressed in the direction shown by the arrow A in the figure, the contact portion P of the tooth 24 is used as a fulcrum and the contact portion Q of the tooth 34 provided on the upper jaw is moved in the opposite direction. The force indicated by arrow C is applied. In the conventional example, a force that is orthogonal to the horizontal axis H acts, but this force is a force that obliquely intersects the horizontal axis, that is, a force that pushes up the inclined surface of the circumference. It has the effect of improving the strength and giving a force that does not easily come off the round bar. Further, since the contact surface with the round bar 18 is curved, the number of contact portions between the round bar and the teeth is increased as compared with the straight teeth. This is because the linear tooth comes into linear contact with the round bar, but when it is curved, it comes into contact with the round bar so as to surround the peripheral wall of the round bar, so that the abutting portion is wide and supports in a stable state. . Therefore, it is possible to hold the round bar more reliably by making the teeth oblique and curving.

Another example of the present invention will be described with reference to FIG. FIG. 4 is an explanatory view of using a pipe wrench showing another example of the present invention. The pipe wrench 50 shown in FIG. 4 has a tooth 53 provided on the main body 52 and a tooth 57 provided on the upper jaw 56.
And are slanted with respect to the longitudinal direction of the main body,
This is a pipe wrench 20 shown in FIG. 1 in which the tooth implants and the curved surfaces of the teeth are linear. Such a pipe wrench 50
However, since the teeth are obliquely crossed, the pipe wrench having a holding force for the round bar can be obtained for the above-described reason, although the effect is somewhat less than that of the example of FIG.

Another example of the present invention will be described with reference to FIGS. FIG. 5 is an explanatory view of a main part of a pipe wrench showing another example of the present invention, and FIG. 6 is an explanatory view showing the operation of FIG. The pipe wrench has a certain degree of opening and closing on the upper jaw, making it easier to pinch the round bar. This is dealt with by mounting the support body 40 supported by the main body so as to rotate about the rotation shaft 48 in the direction indicated by the arrow in the figure. When the pipe wrench is used, the support body 40 is fixed by the contact portions 44, which are the corner portions of the support body 40, contacting the stoppers 27 provided on the main body 22. Another example of the present invention is the support 4
By expanding the range of 0 rotation, the posture of the upper jaw is changed and the bite on the round bar is improved. As a method for expanding the rotation range of the support plate 40, it is possible to change the contact condition between the contact portion 44 and the stopper 27 and further lower the tip of the upper jaw.

The upper jaw 30 of the pipe wrench constructed as described above has a posture as shown in FIG. That is, the upper jaw of the conventional example moves in a parallel state to hold the round bar as shown by the dotted line in the figure with respect to the longitudinal direction of the main body,
According to the above-mentioned structure, the upper jaw 30 can take a posture as if the upper jaw 30 was further bowed. In this posture, the opening-side length W1 of the mouth 29 can be set shorter than the back-side length W2. As a result, the teeth provided on the upper jaw come into contact with the lower side of the horizontal axis H described above with respect to the round bar, so a force that pushes up the round bar by that amount acts,
It is capable of holding a stronger round bar.

[0016]

As described above, according to the present invention, the following effects can be obtained by providing the teeth of the pipe wrench for holding the round bar in a diagonal manner with respect to the handle. .
That is, by rotating each tooth that abuts on both side walls of the round bar so as to push up the slope of the round bar, the biting is improved and the pipe wrench is less likely to idle. Therefore, unlike the conventional example, the problem of rust caused by scratches on the round bar can be prevented by the idle running of the pipe wrench. In addition, by curving each crossed tooth or setting the opening of the mouth narrower than the inner part of the mouth, it was possible to obtain effects such as better biting.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a pipe wrench of the present invention.

FIG. 2 is an exploded perspective view showing a main part of FIG.

FIG. 3 is an explanatory diagram showing an example of use of FIG.

FIG. 4 is an explanatory view of a pipe wrench showing another example of the present invention.

FIG. 5 is an explanatory view of a main part of a pipe wrench showing another example of the present invention.

FIG. 6 is an explanatory diagram showing the operation of FIG.

FIG. 7 is an explanatory diagram of a pipe wrench showing a conventional example of the present invention.

FIG. 8 is an explanatory diagram showing an example of use of FIG. 7.

[Explanation of symbols]

 20 Pipe Wrench 22 Main Body 23 Implant Teeth 24 Curved Surface 28 Handle 29 Mouth 30 Upper Jaw 34 Teeth 36 Screw Groove 40 Support

Claims (3)

[Claims] 1. An implant tooth having a gripping handle for contacting a peripheral wall of a round bar is formed at one end thereof in a convex curved shape, and the implanting tooth intersects with the handle obliquely. The upper jaw, which has teeth formed in a concave curved shape and is arranged so as to face the main body arranged in the main body and the tooth teeth obliquely provided in the main body, and the screw groove formed in one end of the upper jaw. A pipe wrench, comprising: a support for moving the upper jaw in parallel with the main body via the. 2. The curved implanting teeth arranged obliquely with respect to the main body are formed linearly, and the teeth provided on the upper jaw opposite to the implanting teeth are also formed linearly. The pipe wrench according to claim 1, which is characterized in that. 3. The upper jaw is set in a rotatable state by supporting the support member on the main body at one point, and
The pipe wrench according to claim 1 or 2, wherein the opening side of the mouth formed by the teeth provided on the upper jaw and the planted teeth provided on the main body can be set to be narrower than the inner part thereof.